Water Supply Vol 4 No 5-6 pp 305–311 © IWA Publishing 2005
Determination of an effect of 3-chlorophenol on hydroxyl radical generation during ozonation through kinetic study in the power law type
Y.-H. Han*, I. Koshiishi** and H. Utsumi***
*Department of Bio-Function Science, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 maidashi, Higashi, Fukuoka, 812-8582, Japan (E-mail: hyh@pch.phar.kyushu-u.ac.jp; ikoshi@pch.phar.kyushu-u.ac.jp; utsumi@pch.phar.kyushu-u.ac.jp)
**Department of Bio-Function Science, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 maidashi, Higashi, Fukuoka, 812-8582, Japan (E-mail: hyh@pch.phar.kyushu-u.ac.jp; ikoshi@pch.phar.kyushu-u.ac.jp; utsumi@pch.phar.kyushu-u.ac.jp)
***Department of Bio-Function Science, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 maidashi, Higashi, Fukuoka, 812-8582, Japan (E-mail: hyh@pch.phar.kyushu-u.ac.jp; ikoshi@pch.phar.kyushu-u.ac.jp; utsumi@pch.phar.kyushu-u.ac.jp)
ABSTRACT
Ozone decomposition in aqueous solution proceeds through a radical type chain mechanism. These reactions involve the very reactive and catalytic intermediates hydroxyl (OH) radical, O2+ radical, HO2 radical, OH+, H2O2, etc. OH radical is proposed as an important factor in the ozonation of water. In the previous study, generation of OH radical in the ozonation of water containing 3-chlorophenol was mathematically evaluated. In this study, we estimated the kinetic equation for the effect of 3-chlorophenol on OH radical generation during ozonation using the power law equation, in order to analyze it more correctly. The OH radical was trapped with a 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a stable adduct, DMPO-OH. The relationship between the ozone concentration, 3-chlorophenol content, and the initial velocity (Ν0) of DMPO-OH generation was analyzed mathematically, and the following equation was obtained: Ν0 (10+6 M/s)=(1.58 10+5)[3-chlorophenol (10+6 M)][ozone (10+6 M)]2.40+(3.0910+5)[ozone (10+6 M)]1.72. The equation fitted very well with the experimental results, and square of the correlation coefficient was larger than 0.9.
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